Although schools have been identified as important settings in which young people's sexual and reproductive health (SRH) can be promoted, there has been limited research into the role of teachers in delivering sex education programmes. This paper describes findings from a qualitative study of teachers' beliefs and attitudes towards young people's SRH in a Ugandan secondary school, and discusses the ways in which conservative attitudes to young people's sexual activity and an adherence to gender stereotypes can limit students' access to SRH information and services. Teachers' attitudes, beliefs and often superstitions relating to young people's sexual activity inevitably affect the content and nature of school-based sex education. Findings from this preliminary study suggest that, rather than assuming teachers act as neutral delivery mechanisms in schools, these attitudes and beliefs must be taken into consideration and addressed in the development of school-based sex education programmes. (Contains 9 notes.)